Theoretical Analysis and Experimental Investigation of a "tower" Heat Pipe for Desktop Computer Cooling PDF Download
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Author: Tyler Baxter Duncan
Publisher:
ISBN:
Category : Microcomputers
Languages : en
Pages : 150
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Book Description
The current investigation is to develop a high heat flux heat pipe that is intended to dissipate a minimum of 80 W/cm 2 . In order to accomplish this task, a "tower" heat pipe will be developed. In this heat pipe, a vertical tube with an enhanced internal surface of capillary grooves will be used to promote condensation and direct fluid flow. The flat end surfaces will have a wick structure of sintered particles to ensure even wetting of the evaporative region and provide optimal conditions for thin film evaporation. A mathematical model will be developed to predict the heat transfer performance of this "tower" heat pipe. The investigation will result in a better understanding of heat transport capability occurring in a highly efficient heat pipe.
Author: Tyler Baxter Duncan
Publisher:
ISBN:
Category : Microcomputers
Languages : en
Pages : 150
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Book Description
The current investigation is to develop a high heat flux heat pipe that is intended to dissipate a minimum of 80 W/cm 2 . In order to accomplish this task, a "tower" heat pipe will be developed. In this heat pipe, a vertical tube with an enhanced internal surface of capillary grooves will be used to promote condensation and direct fluid flow. The flat end surfaces will have a wick structure of sintered particles to ensure even wetting of the evaporative region and provide optimal conditions for thin film evaporation. A mathematical model will be developed to predict the heat transfer performance of this "tower" heat pipe. The investigation will result in a better understanding of heat transport capability occurring in a highly efficient heat pipe.
Author: Brian V. Borgmeyer
Publisher:
ISBN:
Category : Electronic apparatus and appliances
Languages : en
Pages : 174
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Book Description
As the conventional heat sinks meet their heat transport limit, the pulsating heat pipe as one of advanced phase-change heat transfer devices will present the next generation of electronics cooling. An experimental and theoretical study was conducted regarding the motion of the liquid and vapor slugs within a pulsating heat pipe. A pulsating heat pipe with non-circular channels was investigated to determine the effect of operating parameters such as working fluid, tilted angle, filled liquid ratio, and heat flux level. The mathematical model theoretically solved for the position and velocity of the liquid and vapor slugs using the modified governing equations for a mechanical forced damped system. For comparison, experimental investigations quantified the position and velocity of the liquid-vapor interface through the use of a high speed camera. The mathematical and experimental investigations explored the effect of the various parameters on fluid motion. Experimental data obtained from the high speed camera did not show good relation to the mathematical model developed, however, the effects of each parameter seen in the model related to experimental observations.
Author: Marcia Barbosa Henriques Mantelli
Publisher: Springer Nature
ISBN: 303062773X
Category : Technology & Engineering
Languages : en
Pages : 429
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Book Description
This book is about theories and applications of thermosyphons and heat pipes. It discusses the physical phenomena that drive the working principles of thermosyphons, heat pipes and related technologies. Many applications are discussed in this book, including: rationalizing energy use in industry, solar heating of houses, decrease of water consumption in cooling towers, improvement of the thermal performance of industrial and domestic ovens and driers and new devices for heating stored oil and gas in petrochemical plants. Besides, the book also presents heat pipe and thermosyphon technologies for the thermal management of electronic devices, from portable equipment to airplanes and satellites. The first part of the book explores the physical working principles of thermosyphons and heat pipes, by explaining current heat transfer and thermal resistance models. The author discusses the new heat pipe and thermosyphon technologies that have been developed in the last decade for solving a myriad of electronic, environment and industrial heat and thermal problems. The focus then shifts to the thermosyphon technology applications, and the models and simulations necessary for each application – including vehicles, domestic appliances, water conservation technologies and the thermal control of houses and other structures. Finally, the book looks at the new technologies for heat pipes (mini/micro) and similar devices (loop heat pipes), including new models for prediction of the thermal performance of porous media. This book inspires engineers to adopt innovative approaches to heat transfer problems in equipment and components by applying thermosyphon and heat pipe technologies. It is also of interest to researchers and academics working in the heat transfer field, and to students who wish to learn more about heat transfer devices.
Author: Yaxiong Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 536
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Book Description
Author: Jing Li
Publisher: Springer
ISBN: 3662456230
Category : Technology & Engineering
Languages : en
Pages : 144
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Book Description
Compared to the conventional Rankine cycle using water, the ORC can create efficient expansion at low power, avoid superheater and offer higher thermal efficiency in low temperature application. Small-scale ORCs from several kWe to a few hundred kWe offer great potential for meeting the residential demand on heat and power, and are of growing interest in scientific and technical fields. However, one critical problem is the decreased device efficiency and cost-effectiveness that arises when the ORC is scaled down. In this thesis, the ORC is combined with low concentration-ratio solar collectors. The background, research trend, merits and importance of the solar ORC are described. To reduce the thermodynamic irreversibility and the cost of the system, three innovative solutions are proposed: solar ORC without heat transfer fluid (HTF), which employs two-stage collectors and heat storage units; hybrid solar power generation based on ORC and amorphous silicon cells; osmosis-driven solar ORC. Heat collection, storage and power conversion are optimized. The design, construction and test of a prototype are conducted, demonstrating the feasibility of the ORC for small-scale cogeneration. Special attention is paid to the variable operation and parameter design with respect to the condensation temperature.
Author: Hongbin Ma
Publisher:
ISBN:
Category :
Languages : en
Pages : 414
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Book Description
Author: Brian Grayson Hager
Publisher:
ISBN:
Category : Heat pipes
Languages : en
Pages : 222
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Book Description
Author: P. J. Marto
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 68
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Book Description
Author: P. J. Marto
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 68
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Book Description
An approximate theoretical model is derived for laminar film condensation on the inside of a rotating, truncated cone, and is used to predict the heat transfer performance of rotating, non-capillary heat pipes for a wide variety of parametric conditions. Experimental results are presented for water, ethyl alcohol, and freon-113 in a stainless steel heat pipe rotating to speeds of 2800 rpm. Results show that these devices can be used effectively to transfer large quantities of heat in rotating systems. Predicted results agree to within + or - 20 percent of the experimental data. Dropwise condensation, instead of film condensation, improves heat pipe performance while the presence of non-condensible gases impairs performance.
Author: Anjun Jiao
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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Book Description
The heat pipe, as one of the most efficient heat transport devices, is a peerless choice in the electronic cooling field. In order to better understand the heat transfer mechanisms of the heat pipe, a heat transfer model, which considers the effects of the surface condition, disjoining pressure, gravity force, and contact angle on the thin film profile, heat flux distribution, has been developed. The theoretical analyses showed that the heat transfer in the evaporator could be divided into three templates: CASE I, II, and III with increasing the heat load input. In order to verify the theoretical analysis, experimental investigations of a grooved heat pipe with micro trapezoid wicks, a miniature loop heat pipe with a copper sintered-layer flat evaporator, and a flat heat pipe with the wire core wicks were conducted, respectively. Comparison of the experimental data with theoretical results showed that the model can be used to predict the temperature response in evaporator at low heat load but is invalid at high heat load. The thin film evaporation heat transfer model is successful to address the heat transfer in a cell during the freezing process. In order to obtain ultra-high cooling rate and uniform temperature profiles at cryogenic temperature, one cryogenic oscillating heat pipe with the liquid nitrogen as its working fluid has been developed and experimentally studied. Experimental results showed that its heat transport capability reached 380W with 0, 49 C Ave e c T [delta] = at charged ratio of 48 percent. At steady state, the amplitude temperature response in evaporator was smaller than that of condenser while the temperature response kept the same frequency in both evaporator and condenser. The [delta]T amplitude between evaporator and condenser decreased with increasing the heat load.
